PT-2019-10732 · Denx Software Engineering · Das U-Boot

Published 2019-03-21 · Updated 2023-02-02 · CVE-2018-3968

Positive Technologies (AI Summary)

CVSS v3.1

8.2

High

Base vector

AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Das U-Boot versions 2013.07-rc1 through 2014.07-rc2

Description A security issue exists in the verified boot protection of Das U-Boot, where the affected versions lack proper FIT signature enforcement. This allows an attacker to bypass the verified boot and execute an unsigned kernel embedded in a legacy image format. To exploit this, a local attacker must be able to supply the image to boot.

Recommendations For Das U-Boot versions 2013.07-rc1 through 2014.07-rc2, consider implementing proper FIT signature enforcement to prevent unsigned kernels from being executed. As a temporary workaround, restrict access to the boot process to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

CVE-2018-3968

Affected Products

Das U-Boot

References · 8

• 🔥 https://talosintelligence.com/vulnerability_reports/TALOS-2018-0633 · Exploit
• https://security-tracker.debian.org/tracker/CVE-2018-3968 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2018-3968 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2018-3968 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2018-3968 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-3968 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2018-3968 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2018-3968 · Security Note